Hydraulic elevator



(No Model.) I

E. THAYER. HYDRAULIC ELEVATOR. No. 244,092. Patented July 12, 1881.

i 1 Ib- M a M WITNESSES; v INVENTORI JXWJZQ ELI THAYER,

A BY

ATTYS.

N. PETERS, Phmo-mho m hnr. Washinglon, D4 (1 UNITED STATES PATENT OFFICE.

ELI THAYER, OF WORCESTER, MASSACHUSETTS.

HYD RAULIC ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 244,092, dated July 12, 1881.

Application filed April 24, 1880.

To all whom it may concern Be it known that I,.ELI THAYER, of Worcester, county of WVorcester and State of Mas sachusetts, have invented a new and Improved Hydraulic Elevator; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

This invention consists, mainly, in constructin g the bottom cap of a hydraulic-elevator section with a tubular cuneiform projection, and in complying with the same, in connection with a partially-confined water-volume, for the purpose of arresting the downward movement of the section; and, second, in connection with the base-collar of one section with the stopring and a partially-confined water-volume of the section above it, the construction being such that the upward movement of the section is gradually arrested, so that no shock or jar occurs.

In the drawings, Figure 1 represents a side elevation of my improved elevator, partiallyin section; Fig. 2, a partial view of the upper portion of one tube and the lower portion of another tube ascending through the former, the latter being shown just at the point of coming to rest, the view illustrating the manner of arresting the ascent of the rising tube; Fig. 8, a partial view of the bottom portions of the tubes, the same illustrating the manner of arresting the descent of the same.

To enable others skilled in the art to make and use my improved elevator, I will proceed to describe fully its construction and manner of operation.

A, Figs. 1 and 3, represents the foundation or base piece, consisting, preferably, of a cylindrical casting, having the pipe-section a, with a proper flange for receiving the collar of pipe at, which latter leads away to the accumulator (6 when a pump is employed, or otherwise directly to the main.

(t represents a diaphragm or division-plate in the base-piece, having an opening through the same, preferably located in the center, as shown.

B, Figs. 1 and 3, represents the standing pipe or tube, securely united to the base-piece by means of screw-threads, as shown, which (No model.)

extends any desired distance in an upward direction.

1), Figs. 1 and 2, represents a sleeve upon the top of tube B, by means of which the diameter of ,the same is enlarged for the purpose of affording proper space for a volume of water, and the packing device, hereinafter referred to.

1), Fig.1, represents a shoulder upon the inside of the sleeve, and b an inclined face or wall, the purpose of which will be fully described hereinafter.

O, Figs. 1, 2, and 3, represents the first moving pipe; and c, Fig. 1, a cap strongly secured to the bottom of the same, which is provided with a collar or flange, c, and a tubular cuneiform projection, 0 the purpose of which will be fully described hereinafter. The top of the tube (3 is constructed precisely the same as the top of the tube B, and hence the same will not be described.

D, Figs. 1 and 2, represents a stop or cut-off ring encircling the pipe 0, which rests upon the top of the pipe B in the chamber of the sleeve 12, and is free to move in a vertical direction.

E, Fig. 1, represents a flange-rin g encircling the pipe O, which rests upon the shoulder b of the sleeve 1).

F, Fig. 1, represents projecting rings consisting of proper lengths of rubber tubes coiled upon the flange-ring in such manner as to break joint.

G,Fig.1, represents a clamping sleeve-ring, having a flange, g, and screws 9, by means of which the packing-rings are properly compressed to make a tight joint.

The operation is substantially as follows: The water from the main pump is received in the chamber of the base-piece, and is delivered from it through its central opening, directly beneath the bottom caps of the tubes, its pressure thus being exerted upon the tubes always in a vertical direction. By means of the pressure exerted the tubes are elevated in the usual well-known manner. The upward movement of the sections is gradually arrested at the proper time in the following manner: As each section approaches the end of its upward movement the collar 0 of the bottom cap comes in contact with the stop-ring D of the section below, and consequently lifts the same. By the upward movement of the stop-ring the watervolume above it in the chamber of the sleeve is displaced and caused to flow downward through the space between its outer face and the adjacent wall of the sleeve, as indicated by the arrows in Fig. 2. As the water-space constantly decreases in area as the stop-ring rises, owing to the inclination of the walls, it

follows that the water-volume above it is forced through the water-space into the chamber below more and more slowly, and consequently the motion of the section is arrested before the stop-rin g reaches the packing-ring. By means of this gradual action the section is brought to a full stop without the slightest jar or shock.

The downward movement of the sections is gradually arrested at the proper time in the following manner: As the section approaches the close of its movement in descending, as indicated by the straight arrows in Fig. 3, its tubular cuneiform projection enters the central 3 opening in the part below it and gradually dii minishes the area of the same. The water-volume in the chamber between the two caps, or between the lower cap and the diaphragm, 5 which flows through the opening, as indicated by the curved arrows, Fig. 3, exerts a constantly increasing resistance, owing to the constantly-diminishin g area of the same, which resistance serves, finally, to arrest the movement of the section.

Some of the advantages of the described construction are as follows: By the employment of the tubular projections the pressure of the water is readily delivered through them to the upper sections. By the employment of I a bottom cap, also having atubular cuneiform projection, in connection with a diaphragm or another cap having an opening for partially compressing a water-volume, the downward motion of the section is arrested with absolute certainty and without shock or jar. By the employment of the collar, in connection with the ring and a confined water-volume, the upward movement of the section is arrested with absolute certainty and without shock or jar.

I do not claim in this application a projection which is solidthat is, which is without an opening for the passage of water.

I do not claim in the application a solid projection; but

Having thus fully described my invention, A

what I claim as new, and desire to secure by Letter Patent, is

1. In a hydraulic sectional elevator, the combination, witha bottom cap having a tubular projection, of a diaphragm or cap having a corresponding projection, the construction being such that the water-pressure may be delivered through the tubular projection or projections to the upper sections, and the movement be arrested in descent, also, bya partially-confin ed water-column.

2. In combination with the base-collar of one section, the stop-ring and chamber containing the partially-confined water-volume of another section, substantially as described.

This specification signed and witnessed this 24th day of April, 1880.

ELI THAYER.

Witnesses:

ALBERT Z. BEADLE, N. L. Wnsr. 

